材料科学
复合材料
热导率
氮化硼
扫描电子显微镜
极限抗拉强度
聚乙烯
挤压
电导率
物理化学
化学
作者
Guangjian He,Zhihao Lin,Xianze Yin,Yanhong Feng
摘要
Abstract Ultra‐high‐molecular‐weight polyethylene/boron nitride (BN) composites have been continuously prepared successfully by eccentric rotor extruder (ERE) based on elongational flow. Optical microscopy (OM), scanning electron microscopy (SEM), x‐ray diffraction (XRD), thermal conductivity test, heat‐dissipation test, and tensile test were performed to investigate the orientation structure, thermal conductivity, mechanical properties, and insulation properties. The orientation factor and thermal conductivity of the composites prepared by ERE were 79.3 and 3.75 W·m −1 ·K −1 , which were much higher than those of composites prepared with a torque mixer (14.7 and 2.73 W·m −1 ·K −1 , respectively). OM and SEM showed that the BN sheets were in contact inside the composites and formed an efficient thermal conductivity network. Besides, the composites prepared by ERE had satisfactory mechanical and insulation properties (>10 13 Ω·cm). This study provides experimental and theoretical guidance for industrial preparation of polymer/layered‐filler functional composites.
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